Can a 18 year old girl handle the same penis size as an aged woman?

Hi ladies I have a question... that has me thinking... I'm a dude so I don't know this one so help me out here ladies... more than anything is just...
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Hi ladies I have a question... that has me thinking... I'm a dude so I don't know this one so help me out here ladies... more than anything is just plain curiosity haha... so my question is can a teen girl who can have sex legally take in the same penis size that a 30 or 40 year old woman can? if so how is that possible if I thought the younger you were the smaller your vagina was? explain to me lol